Cross

Cross has a revenge theme, but it mostly revolved around medial practice, and just delightful to watch.

Both are medical drama
Both has revenge as underlying theme
Both have illegal heart transplant in it
Vibe of the story is same

Both are based on medical practice and has a gory feel.... The cross is mainly focused on revenge whilst Life is mainly focused on the business side of hospital. There is little to no romance in both show.

Both have operations with transplants. Both have a main character who cares deeply about patients. Both have a reasonable numbers of operations. One is more about revenge (cross), but overall both have elements like corruption and all.
Two must watch for who likes the genre.

They both have Genius Doctors in it who are working to find someone they loved in the past. I think Doctor Stranger is a little better than Cross both in acting and plot. Definitely check it out if you haven't seen it already. Oh and Lee Jong Suk is in it, so theres that.

Both dramas are korean dramas about doctors which are skilled professional in their field. But they resign and become doctors in prison in order to get revenge.

Both shows tell the story of doctors who were adopted as children and have difficulties in expressing their feelings

Both are medical dramas with surgery scenes.
Cross has overarching mystery plot in it but medical background of the drama is similar to Trauma code.
There is no romance plot just friendships.